{
  "id": "1812.09889",
  "version": "v1",
  "published": "2018-12-24T11:07:09.000Z",
  "updated": "2018-12-24T11:07:09.000Z",
  "title": "Acoustic plasmons at the crossover between the collisionless and hydrodynamic regimes in two-dimensional electron liquids",
  "authors": [
    "Iacopo Torre",
    "Luan Vieira de Castro",
    "Ben Van Duppen",
    "David Barcons Ruiz",
    "François M. Peeters",
    "Frank H. L. Koppens",
    "Marco Polini"
  ],
  "comment": "14 pages, 4 figures",
  "categories": [
    "cond-mat.mes-hall",
    "cond-mat.str-el"
  ],
  "abstract": "Hydrodynamic flow in two-dimensional electron systems has so far been probed only by dc transport and scanning gate microscopy measurements. In this work we discuss theoretically signatures of the hydrodynamic regime in near-field optical microscopy. We analyze the dispersion of acoustic plasmon modes in two-dimensional electron liquids using a non-local conductivity that takes into account the effects of (momentum-conserving) electron-electron collisions, (momentum-relaxing) electron-phonon and electron-impurity collisions, and many-body interactions beyond the celebrated Random Phase Approximation. We derive the dispersion and, most importantly, the damping of acoustic plasmon modes and their coupling to a near-field probe, identifying key experimental signatures of the crossover between collisionless and hydrodynamic regimes.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2018-12-24T11:07:09.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "two-dimensional electron liquids",
      "hydrodynamic regime",
      "acoustic plasmon modes",
      "scanning gate microscopy measurements",
      "celebrated random phase approximation"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 14,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}